Directed Transverse Momentum and Multi-Particle Emission in Intermediate Energy Nucleus-Nucleus Collisions

We have measured directed transverse momentum and multi-fragment emission for the systems of 35 MeV/nucleon 40Ar-51V, 50 MeV/nucleon 12C + 12C, and 50, 70, and 130 MeV/nucleon 139La + 139La. We observe that directed transverse momentum increases with decreasing mass of the system at energies around 50 MeV/nucleon. In addition the directed transverse momentum goes to 0 as the beam energy is decreased from 130 to 50 MeV/nucleon for La + La. We present results for multiparticle emission from the same systems in terms of global momentum space variables. We demonstrate that there are observable differences between sequential and simultaneous emission dynamics using global variables. Our results for 35 MeV/nucleon Ar + V fall closer to the sequential simulations than the simultaneous.